Automatic damper control.



.H. PETERSON.

AUTOMATIC DAMPER CONTROL.

APPLICATION FILED DEO.16, 1909.

956,542, Patented May 3, 1910.

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ANDREW a GRAHAM c0 FHOTOMTHOGRAPNERS. wAsmNG'rcN. a1;

UNITED STATES PATENT OFFICE.

HJALMAR PETERSON, OF FALUN, WISCONSIN.

AUTOMATIC DAMPER CONTROL.

To all whom it may concern:

Be it known that I, HJALMAR PnTnRsoN, a citizen of the United States,residing at Falun, in the county of Burnett and State of Wisconsin, haveinvented certain new and useful Improvements in Automatic DamperControls, of which the following is a specification.

This invention relates to automatic damper controls and is designedparticularly for use in steam or hot water heating systems.

The object of this invention is to construct a device of this characterwhich will be operated by the pressure of the steam in the boiler, andwhich will be adjustable to various pressures.

This invention also contemplates a damper control that will entirely orpartially close the damper, and which will be adjustable to varioussizes of furnaces.

With the above and other objects in view this invention consists of theconstruction, combination and arrangement of parts all as hereinaftermore fully described, claimed and illustrated in the accompanyingdrawings, wherein:

Figure 1 is a central longitudinal section of a control constructed inaccordance with the present invention illustrating the means ofattaching the same to a boiler; Fig. 2 is a section taken along line 22of Fig. 1; Fig. 3 is a similar view taken along line 33 of Fig. 1; Fig.a is a horizontal section taken along line 44 of Fig. 1.

Referring more particularly to the drawings, the control forming thesubject-matter of the present invention comprises a tubular casing 1having at its upper extremity an inlet port 2, said inlet port beingconnected to a valve 3, from which extends the supply pipe 4 to theboiler indicated in general as A. At the opposite extremity of thecasing 1 is the transverse bridge 5, said bridge being provided with thecentrally disposed aperture 6, the lower face of said bridge surroundingthe aperture being provided with the downwardly extending flange 7 Apiston 8 reciprocates in said casing 1 and forms a chamber B in thesame. This piston has an outwardly extending flange 9 about its upperperiphery, above which'is carried the leather packing 10 secured theretoby the ring 11. The lower side of the piston has a similar packing 12likewise secured to the piston by a ring 13, said ring being secured tothe ring 11 by a series Specification of Letters Patent.

Application filed December 16, 1909.

Patented May 3, 1910.

Serial No. 533,362.

of bolts 14 extending through the leather packings 10 and 12 and therings 11 and 13;

.the elements thus combined forming a substantial water tight and airtight piston.

The piston rod 15 is threaded into the piston at its upper extremity andextends through the opening 6 of the bridge and is bifurcated at itslower extremity forming the arms 16. The upper extremity of the pistonrod is provided with the longitudinal bore 17, said longitudinal boreextending partially the length of the piston rod and having on the levelwith the base thereof the faucet 18. In this manner all water ofcondensation collecting in the chamber B may be drawn therefrom andretain the pressure in said chamber constant with that existing in theboiler A.

Arranged on one side of the casing 1 are the outwardly projecting earsor lugs 19 between which is pivotally connected the link 20, said linkbeing pivotally secured to the operating lever 21, forming a fulcrum forthe same. That part of the lever which extends horizontally from thecasing is provided with a series of notches 22 on the upper edge thereofin which is adapted to be received the weight 23. The lever adja centthe opening 6 is spanned by thearms 16 of the piston rod and is securedthereto by a pin piercing said lever and arms. Located on the oppositeside of the lever 21 and spaced apart a distance equivalentapproximatelyto the width of the casing are the downwardly projecting ears 24: inwhich is swivelecl the screw 25, having threaded thereon the sleeve 26,said sleeve constructed with a pair of downwardly projecting arms 27formed thereon. It will be noticed that upon the rotation of the screw25, the sleeve 26 can be adjusted with respect to the transverse axis ofthe casing. A rod 28 is pivoted between the arms 27 and has formed atits lower extremity the laterally extending orificed lugs 29. The damperrod 30, having a plurality of alined openings 31 in its upper extremity,is adapted to be received between the lugs 29 of the rod 28 in such amanner that the openings 31 will register with the similar openings ofthe lugs, permitting a pin 32 to be passed through the same and supply avertical adjustment to the damper rod.

From the foregoing it will readily be seen that as the pressureincreases in the boiler A, so will the pressure increase in the chamber13, and when it has increased to such an extent that it overpowers theforce of the weight 23 carried on the lever arm, the piston and pistonrod will move downwardly, imparting a simliar motion to the damper rod,closing the damper as permitted by the adjustment of the variouselements. Thus, the fire will be permitted to cool and the pressure inthe boiler to decrease,-'consequently, permitting the piston to riseopening the damper again and permitting the fire to burn more readily.

The provision of the screw 25 will permit the sleeve to be adjusted insuch a manner that the damper rod will reciprocate a distance of anyratio to the distance through which the piston reciprocates.

Should the sleeve be located on the screw 25 adjacent the weight arm,the rod will reciprocate very little, while should it be located at theopposite. extremity thereto, the reciprocation thereof will beapproximately twice as great as that of the piston. This adjustmentpermits the damper to have a range of movement varying from a hardlyperceptible amount to being entirely closed. The provision of thevertical adjustment of the damper rod is a means whereby the position ofthe damper may be regulated independent of the screw 25, also a meanswhereby the automatic control hereinbefore described may be adapted tovarious sizes of furnaces.

Having thus fully described my invention, what is claimed as new is:

1. An automatic damper control comprising a damper, a cylindricalcasing, having an inlet port at its upper extremity and a transversebridge at the lower, a piston reciprocating in said casing, a piston rodsecured to said piston and reciprocating in said bridge, having alongitudinal bore in its upper extremity, a lever pivoted to said casingthrough the instrumentality of a link, having means for securing theweight at one extremity and a pair of outwardly extending ears at theother, said lever being connected to said piston rod, a screw swiveledin said ears, a sleeve threaded on said screw, and a verticallyadjustable damper rod pivotally secured to said sleeve, as and for thepurpose set forth.

2. An automatic damper control comprising a cylindrical casing, havingan inlet port at its upper extremity and a transverse bridge at thelower, a piston reciprocating in said casing, a partially hollow pistonrod secured to said piston and reciprocating in said bridge, a leverpivoted to said casing through the instrumentality of a link, having anadjustable weight at one extremity and the other extremity being securedto the piston rod, adamper rod pivotally connected to said lever, meanswhereby the stroke of the piston may be regulated in various ratios tothe stroke of the damper rod, and a drain cock at the lower extremity ofthe hollow portion of said piston rod adapted to remove the water ofcondensation from above the piston.

In testimony whereof I afiix my signature in presence of two witnesses.

HJALMAR PETERSON. lVitnesses JOHN PETERSON, H. HAv'soN.

